Zoos are unnatural, Keeping animals in zoo constitutes is one of the greatest injustices of all time.
Zoos keep animals mainly for public viewing. If animals were truly kept to avoid extinction, then we would have conservatories dedicated for that purpose.
Furthermore, if you view animals at the zoo you will see that these animals spend most of their existence trying to escape. For the most part these animals do not want to be kept in captivity. All in all, zoos are prisons for animals.
These animals don't have voices, let's help them and get them heard today!